Photos on the iPad

So, I don't want to appear too dense here but how exactly does one get photos on to the iPad? I am not talking about photos from the camera or a card as they have the camera adapters for that. I am talking about photos already on my PC.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.